Genesis 18:10 in the King James Version
And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him.
Context
9 They asked him, “Where is Sarah, your wife?” He said, “There, in the tent.”
10 He said, “I will certainly return to you at about this time next year; and behold, Sarah your wife will have a son.” Sarah heard in the tent door, which was behind him.
11 Now Abraham and Sarah were old, well advanced in age. Sarah had passed the age of childbearing.